一种塑料袋长30厘米，宽16厘米，做10个这样的塑料袋至少要用塑料薄膜 平方厘米．
直接写出得数+=﹣=+= 1﹣=+==+=﹣= 3﹣=+= 3÷7= 43=
直接写得数．+= 3﹣1.75=÷=×=×=÷=÷=×0+3=（+）×=
直接写出得数．+=﹣=×2=×=÷3×÷3== 12×=×14=÷4=+÷+=
直接写得数+= 3+1.75=÷=×=×=﹣=+=×0+3= （+）×=×÷×=
口算下面各题．﹣=+=﹣= 2÷=×6=÷=×6=×=﹣=÷=÷=×=×=÷=÷= 6.4÷0.08= 4﹣2.92=÷=
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